Seam for sewed articles.



G. S. SAVIGNAC & C. E. MYERS.

SEAM FOR SEWED ARTICLES.

APPLICATION FILED MAYZQ, 1911.

1,1 14,533. Patented Opt. 20, 1914.

Zl/z'izwsses:

UNITED STATES PATENT OFFICE;

eEoEe-E s. savrennc Ann cnAELEs E. names, or sr. LOUIS, ivzrsso'cni, AssIGnoEs, BY MESNE ASSIGNMENTS, TO SIMPLEX snoE MACHINERY COMPANY, on ST. LOUIS, MIssoUEr, A CORPORATION or MicssoUEI. i y

SEAM FOR SEWED AR'lIOIJilS.v

and CrIARLEs E. MYERs, citizens of the United States, and residents'of the city of St. Louis and State ofMissouri, have invented a new and useful Improvement in Seams for Sewed Articles, of which the following is a specification. f

-This invention relates to stitches for sewing leather and other heavy material of a similar nature.

It relates more particularly to loop-lock stitches, and has for its principal objects to produce a strong and durable stitch for heavy work, such as shoe soles, harness, and

the like; to produce a stitch which givesthe required flexibility to the sewed material and permits of considerable wear without breaking the stitch; to produce a stitch which is simple in formation and readily vmade by machinery; and to attain certain advantages hereinafter more fully appear- 111g.

In stitching according to the ordinary method of making a loop-lock-stitch the needle thread or stitching thread proper and the locking-loop thread are usually-of the same kind and size. That is, the two threads comprise the same number of cords or strands. The puncture in the material to be stitched is made straight and of substantially the same cross dimensions throughout; and the locking-loop is drawn by the needle loop into the puncture.

In sewing shoe soles the locking-loop thread is usually on the outside of the sole, and to permit of a certain amount of wear upon the sole before the stitches become worn and weakened the locking-loop thread intermediate the loops is usually drawn into a groove provided therefor in the sole. After the sole is worn down and" thegroove is obliterated, the stitches soon become worn and broken; and, consequently, the layers of the sole rip apart. So, too, in drawing the ordinary locking-loop-stiteh tight, the flexibility of the stitched sole is impaired.

The present invention is designed to overcome the disadvantages above noted and it consists in the features and arrangements and combinations hereinafter described and claimed.

In the accompanying drawing which forms part of the specification and wherein Specification of Letters Patent.

Application filed May 29, 1911.

Patented Oct. 20, 1914.

Serial No. 630,227.

like symbols refer to like parts wherever they occur,F1gure 1 is an enlarged section through two layers of material showing the completed stitch and formation thereof ac-,

cording to our invention; Fig. 2 is a view similar to Fig. 1 showing the locking-loop thread obliterated excepting the portions constituting the locking-loops; Fig. 3 is a fragmentary view showing a modification of the awl and puncture; and Fig. l is a similar view of a further modification of the awl and puncture.

In producing a stitch according to our invention any ordinary loop-loclr-stitch machine may be used, eXcept that the awl or puncturing element must be provided with an enlargement or tapering portion, so that the portion of the puncture in the work which receives the locking-loop is made considerably larger than the portion through straight while the puncture b in the layer B is outwardly flaring, being obviously formed by the awl C. The stitching thread proper 3 is passed through the eye of a needle D which carries the thread through the punctures in the layers A. and B .a sufficient distance to leave a loop 3 beyond the outer face of the layer B.

The locking-loop thread 4 may be carried in any desirable manner and laid through the needle thread loop 3. Usually the locking-loop thread 4 is looped around areciprocatory device adapted to lay the loop 4:? through the needle thread loop 3 and back away so that the take-up device may draw i the needle thread and pull. thetwo loops 3 and 4? interlocked into the puncture in the layer B. I

In practice, the puncture a in layer A is just large enough to permit the double thickness of the needle thread loop to be drawn therethrough, while the flared puncture b in the layer B is large enough at its outer end to readily receive the quadruple thickness of the locking-loop thread and double thickness of the needle thread loop. When the needle thread is pulled by the take-up device the interlocked looped portions 3 and r of the two threads 8 and 4 are wedged in the flared opening. While it is obvious that the combined six thicknesses of thread forming the lock cannot be drawn into the smaller puncture a, yet, in some cases, it is preferable to use a heavier cord for the lockingloop than that which is used for the needle loop. For example, the needle thread may be a six cord thread and the locking-loop thread a twelve cord or twice as heavy as the needle thread. However, in other cases, the needle thread may be the heavier.

When the stitch is used for shoe soles the portions of the locking-loop thread between the punctures may be obliterated, thereby leaving only the wedged locking-loops embedded in the tapered punctures 6. Hence, the shoe sole will be more flexible than if the tightly drawn portions of the locking-loop thread intermediate the locking-loops were not obliterated. So, too, the bottom layer B of the shoe sole may be worn nearly away and yet the remaining portion of the layer B will not rip apart from the layer A. Furthermore, it is not necessary to groove the bottom of the shoe sole as in the case of the ordinary loop-lock-stitch where protection must be made for the locking-loop thread to prevent it from being worn and out.

In Figs. 3 and 4: modifications of the form of the awl and puncture in the work are shown. In the former, the awl is round in cross section and, instead of making the entire puncture tapered in the layer B of the work, only a portion is tapered; and in the latter figure, the aWl is shown as being round in cross section and of two diameters with a rounded shoulder, so as to produce the counterpart puncture shown.

In practice, the lockingloop thread, and in some cases, both threads may be waxed in the usual manner; but we prefer to treat the threads with a liquid cementitious substance, which in hardening, makes asub stantially solid wedge of the interlocked loops. In effect, the locking-loops thus treated, form substantially wedge-shaped or rivet heads, or pegs, so that the bottom of the shoe sole may be scraped and sandpapered and otherwise finished and polished; and

the sole may be worn nearly away, as above set forth, and yet the layers hold together.

Another advantage in the present stitch over the ordinary stitch is that the leather is pressed so as to close tightly around the loops of the preceding stitches as the tapered or enlarged portion of the awl is forming the puncture for the succeeding stitch. Obviously, the shape of the puncture in the layer which receives the locking-loop may be varied without departing from our invention so long as the inner portion of the puncture is considerably smaller than the outer, so as to prevent the interlocked loops from pulling therethrough. Therefore, we do not wish to be limited to the specific form shown, nor do we wish to be limited to any particular machine for producing the stitch.

What we claim is:

1. Layers of leather or like material sewed together by looplocked stitches, the punctures therefor extending entirely through the work from top to bottom and flaring toward the lock side of the work, the successive flared portions being spaced apart, and the loop-locked portions of the thread being held squeezed in the flared portions of the punctures.

2. Layers or" leather or like material sewed together by a continuous thread, looped successively through the work, the punctures therefor extending through the work from top to bottom, the flared portions being spaced apart, and lock-loops of thread inserted through the loops of said first mentioned thread, the interlocked portions of the threads being held squeezed in the enlargements of the respective punctures.

3. Layers of leather or like material sewed together by a continuous thread, looped successively through the work, the punctures therefor extending through the work from top to bottom, the flared portions being spaced apart, and lock-loops of heavier thread inserted through the loops of said first mentioned thread, the interlocked portions of the threads being held squeezed in the enlargements of the respective punctures.

Signed at St. Louis, Missouri, this 26th day of May, 1911.

enoaon s. SAVIGNAO. CHARLES E. MYERS.

Witnesses:

Gno. P. BURLEIGH, Gnonen A. PENNINGTON.

Copies of this patent may be obtained for five cents each, by addressing the Gommissioner of Patents,

Washington, D. 0. 

